package com.lanou3g.code0516;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * If there are no bugs, it was created by Chen FengYao on 2018/5/16;
 * Otherwise, I don't know who created it either
 */

@WebServlet(name = "WelcomeServlet",urlPatterns = "/welcome")
public class WelcomeServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        HttpSession session = request.getSession();
        String username = (String) session
                .getAttribute("username");
        if (username == null){
            // 还没登录
            // 去登录页面登录
            response.sendRedirect(request.getContextPath()
            + "/user/login.jsp");
        } else {
            // 代表登录过了
            request.getRequestDispatcher("/WEB-INF/welcome.jsp")
                    .forward(request,response);
        }

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}
